diff --git a/py/hexagram/fuel.py b/py/hexagram/fuel.py
index eacacbf..7dc5481 100644
--- a/py/hexagram/fuel.py
+++ b/py/hexagram/fuel.py
@@ -15,6 +15,8 @@ class FuelGauge(Dial):
     def __init__(self, x: float, y: float, radius: float):
         super().__init__(x, y, radius, self.MIN_ANGLE, self.MAX_ANGLE, self.MAX_VALUE)
 
+        self.value = 0
+
     def draw_value(self, cr: cairo.Context, radius: float, value: float, text: str, x_offset: float):
         scale = (self.max_value - value) / self.max_value
         angle = self.min_angle + ((self.max_angle - self.min_angle) * scale) - self.ANGLE_OFFSET